Can't view the report with Crystal reports

I am using crystal reports 8.5 and I've done several projects using this versions crystal report controller. One of my projects had this problem. When I set the rptcon.action=1
the report is opening but it is closing automatically and immediately. When I select a printer It gives print outs. Can anybody describe what has happened.

Thank you.

Public Sub ShowReport()

With CRT
selectMe = "year({salary.SDate})=" & DTP.Year & "and month({salary.SDate})=" & DTP.Month
.ReportFileName = App.Path & "\Reports\MonthR.rpt"
.SelectionFormula = selectMe
.Action = 1
End With

End Sub

CAN U SEND UR CODE???

Your code is ok. But my problem is still the same. This is my problem
Report is generated.
But no time to view.
Report is closed.
I'll send my code and the report herewith.
Private Sub PrintInvoice()

On Error GoTo ErrorHandler
With rptPItemSales
.ReportFileName = App.Path + "\..\Reports\rptSalesByItems.rpt"
'.DiscardSavedData = True
.SelectionFormula = "{tblInvoiceHeader.strInvNo} = '" & txtInvNo.Text & "'"
'.PrinterName = "EPSON LQ-300+ ESC/P 2"
'.Destination = crptToWindow
.Action = 1

End With
ExitRoutine:
Exit Sub
ErrorHandler:
MsgBox "There is an error while printing " + Err.Description
Resume ExitRoutine
End Sub

Moved to reporting section.